Let's start easy: Suppose I draw just one, what is the chance that it is black?
Now, I have a deck with 51 cards, of which 26 are red and 25 black. I draw one, what is the chance that it is red? Now what is the chance that both happen in sequence?
Now do the same for the case where the red one is drawn first, and add the probabilities.

Let's start easy: Suppose I draw just one, what is the chance that it is black?
Now, I have a deck with 51 cards, of which 26 are red and 25 black. I draw one, what is the chance that it is red? Now what is the chance that both happen in sequence?
Now do the same for the case where the red one is drawn first, and add the probabilities.

As CompuChip suggested, try the above method and post what you get. You might also want to familiarize and brush up on combinatorics. If you know how to calculate permutation and combination, it should be good, at least for now. This makes your job "slightly" easier in the above problem, and very easy in problems like, choosing four cards from 52 each of different suite. In that case, it can take a while to calculate the various ways of suite selection (i.e. first hearts, then spades etc. and also other combinations).

But if your combinatorics is good, then you can directly use those concepts in calculating Probability, that makes your life easier.